nav.nav{ position:sticky; top:0; z-index:20; background:#fff; border-bottom:1px solid var(--line); display:flex; gap:4px; padding:8px 18px; overflow-x:auto; box-shadow:0 1px 4px rgba(20,40,70,.06); }
  .navbtn{ border:1px solid transparent; background:transparent; color:#5b6673; border-radius:8px; padding:9px 16px; font-size:13px; font-weight:600; cursor:pointer; white-space:nowrap; }
  .navbtn:hover{ background:#f0f4f9; color:var(--blue-d); }
  .navbtn.active{ background:var(--blue); color:#fff; }
  .page{ animation:fade .18s ease; }
  @keyframes fade{ from{opacity:0; transform:translateY(4px);} to{opacity:1; transform:none;} }